Barking dogs

These dogs bark like crazy every single day of the week starting at 6am for at least 20 minutes and then later in the day all day at random intervals. If a car drives past or someone walks past they go off. Appeals to the body corporate have been fruitless and the neighbouring complex are also complaining but nothing g3ts done. We sometimes see the dogs sitting on the stairs and just barking every few seconds at nothing. Please help.